FUNCTIONAL TRAVEL PATTERNS IN URBAN TRANSPORTATION

A NEW MEANS OF CLASSIFYING URBAN TRAVEL IS DESCRIBED, BASED ON THE NECESSITY AND REGULARITY OF TRAVEL AS SEEN FROM THE INDIVIDUAL'S VIEWPOINT. BY CONSIDERING THE FUNCTIONAL DIMENSIONS IN CONJUNCTION WITH THE SYSTEM QUALITIES: SPEED, COMFORT, ETC., DEMANDED BY TRAVELERS, A THREE-DIMENSIONAL MATRIX IS GENERATED WHICH COMPACTLY SUMMARIZES THE RESULTS OF THE ANALYSIS. CONSTRUCTION OF THE MATRIX, HOWEVER, REQUIRES DEFINITION OF A SIGNIFICANT ADDITIONAL DATA, THE DEMAND SATISFACTION FACTOR. DATA FROM THE PITTSBURGH AREA TRANSPORTATION STUDY ARE USED FOR A SIMPLIFIED ANALYSIS EXAMPLE. BASED ON THIS SIMPLIFIED SAMPLE, IT IS FOUND THAT IF ONLY A SMALL FRACTION OF THE TOTAL TRAVELLING PUBLIC IS TO BE SATISFIED, THEN A SINGLE TRANSPORTATION SUBSYSTEM CAN SATISFY SEVERAL DIFFERENT (BUT NOT ALL) TRAVEL CATEGORIES. IF A LARGE FRACTION OF THE TRAVELLING PUBLIC IS TO BE SATISFIED, HOWEVER, SEVERAL SEMI-SPECIALIZED SUBSYSTEMS APPEAR TO BE NECESSARY.